BIND 9.20.3 Race condition updating the ADB
BIND 9.20.3 Race condition updating the ADB:
A race condition has been discovered in which an ADB find might be cancelled by
a different thread while requiring the ADB find the lock. When cancelling a find,
we release and reacquire the lock on the find to get a lock on the ADB name. The
same find can be cancelled from a different thread when the answer arrives.